No, 64-bit will not be in the next version. They are focusing on cross-platform development for this release. 64-bit will be in the version after that (2012?). Some people may argue that 64-bit is a new platform, so why not support it in the upcoming cross-platform release. Well, because the compiler is not set up to handle the new architectures that 64-bit requires. The other platforms being targetted (Windows and Mac, and a preview for Linux) still support 32-bit executables.